This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Large Eddy Simulation of Flow over a Valve in a Simplified Cylinder Geometry
Technical Paper
2011-01-0843
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
This study focuses on gaining a deeper understanding on the formation of turbulence and other in-cylinder flow structures caused by the intake jets during the intake stroke in internal combustion engines. This is important as the in-cylinder turbulence has a large effect on the mixing of fuel and oxidizer. A fine resolution large eddy simulation (LES) is carried out on an incompressible flow (Re is equivalent to 100,000) over a static valve (lift d = 7 mm) alongside with three other simulations using coarser meshes. The problem is studied in a simplified valve-cylinder geometry on which experimental data by Yasar et al., (2006) is available. The vortex cores, produced by the shear layer of the intake jets, are visualized using the λ₂ definition for vortex cores. The governing flow structures are identified and some features of the flow's mixing capabilities are observed. Additionally, the mixing is studied by releasing a passive scalar into to the flow. The simulations are carried out using the OpenFOAM CFD software with a transient solver for incompressible flows. The computational mesh is created with an automated grid generator, based on splitting of hexahedral cells, that allows the building of a mesh with an optimal cell size distribution for LES with high resolution near the wall and within the shear layer of the intake jets. The results of the simulation imply that the used numerical solution algorithm together with a novel grid generation strategy produces realistic results. The present work is one first studies that considers high resolution LES of an intake flow. The paper is the authoritative source for the abstract.
Recommended Content
Topic
Citation
Keskinen, J., Vuorinen, V., and Larmi, M., "Large Eddy Simulation of Flow over a Valve in a Simplified Cylinder Geometry," SAE Technical Paper 2011-01-0843, 2011, https://doi.org/10.4271/2011-01-0843.Also In
References
- Pope, S. B. “Turbulent Flows” Cambridge University Press 2000
- Drake, M. C. Haworth, D. C. “Advanced Gasoline Engine Development Using Optical Diagnostics and Numerical Modeling” Proc. Combust. Inst. 31 99 124 2007
- Vermorel, O. Richard, S. Colin, O. Angelberger, C. Benkenida, A. Veynante, D. “Towards the Understanding of Cyclic Variability in a Spark Ignited Engine Using Multi-Cycle LES” Combust. Flame 156 1525 1541 2009
- Lilek, Ž. Nadarajah, S. Perić, M. Tindal, M. Yianneskis, M. “Measurements and Simulation of the Flow Around a Poppet Valve” Eight Symposium on Turbulent Shear Flows 1 13-2-1 13-2-6 1991
- Thobois, L. Rymer, G. Soulères, T. Poinsot, T. “Large-Eddy Simulation in IC Engine Geometries,” SAE Technical Paper 2004-01-1854 2004 10.4271/2004-01-1854
- Thobois, L. Rymer, G. Soulerès, T. Poinsot, T. van den Heuvel, B. “Large-Eddy Simulation for the Prediction of Aerodynamics in IC Engines” Int. J. Veh, Des. 39 368 382 2005
- Huijnen, V. Somers, L. Baert, R. de Goey, L. Olbricht, C. Sadiki, A. Janicka, J. “Study of Turbulent Flow Structures of a Practical Steady Engine Head Flow Using Large-Eddy Simulations” J. Fluids Eng. 128 1181 1191 2006
- Devesa, A. Moreau, J. Hélie, J. Faivre, V. Poinsot, T. “Initial Conditions for Large Eddy Simulations of Piston Engine Flows” Combust. Flame 36 701 713 2005 10.1016/j.compfluid.2006.02.006
- Wu, H.-W. Perng, S.-W. “LES Analysis of Turbulent Flow and Heat Transfer in Motored Engines with Various SGS Models” Int. J. Heat Mess Transfer 45 2315 2328 2002
- Jhavar, R. Rutland, C. J. “Using Large Eddy Simulations to Study Mixing Effects in Early Injection Diesel Engine Combustion,” SAE Technical Paper 2006-01-0871 2006 10.4271/2006-01-0871
- Goryntsev, D. Sadiki, A. Klein, M. Janicka, J. “Large Eddy Simulation Based Analysis of the Effects of Cycle-to-Cycle Variations on Air-Fuel Mixing in Realistic DISI IC-Engines” Proc. Combust. Inst. 32 2759 2766 2009
- Enaux, B. Granet, V. Vermorel, O. Lacour, C. Thobois, L. Dugué, V. Poinsot, T. “Large-Eddy Simulations of a Motored Single-Cylinder Piston Engine: Numerical Strategies and Validation” Flow Turbulence and Combustion 2010 10.1007/s10494-010-9299-7
- Richard, S. Colin, O. Vermorel, O. Benkedina, A. Angelberger, C. Veynante, D. “Towards Large Eddy Simulation of Combustion in Spark Ignition Engines” Proc. Combust. Inst. 31 3059 3066 2007
- Bohbot, J. Knop, V. Laget, O. Angelberger, C. Réveillé, B. “High Performance 3D CFD Codes for Complex Piston Engine Applications,” International Multidimensional Engine Modeling User's Group Meeting, SAE World Congress April 2010
- Heywood, T. B. “Internal Combustion Engine Fundamentals McGraw-Hill 1988
- Yasar, A. Sahin, B. Aydin, K. “Effect of the Inlet Port on the Flow in the Cylinder of an Internal Combustion Engine” Proc. Inst. Mech. Eng. Part C J. Mech. Eng. Sci. 220 73 82 2006
- Ferziger, J. H. Perić, M. “Computational Methods for Fluid Dynamics” Springer 1999 2 nd
- Smagorinsky, J. “General Circulation Experiments with the Primitive Equations” Monthly Weather Review 91 99 164 1963
- Germano, M. Piomelli, U. Moin, P. Cabot, W. H. “A Dynamic Subgrid-Scale Eddy Viscosity Model” Phys. Fluids 3 1760 1765 1991
- Lilly, D. K. “A Proposed Modification of the Germano Subgrid-Scale Closure Method” Phys. Fluids 4 633 635 1992
- Grinstein, F. F. Margolin, L.G. Rider, W. J. “Implicit Large Eddy Simulation” Cambridge University Press 2007
- Fureby, C. Tabor, G. Weller, G. Gosman, A. D. “A Comparative Study of Subgrid Scale Models in Homogeneous Isotropic Turbulence” Phys. Fluids 9 1416 1428 1997
- Olsson, M. Fuchs, L. “Large Eddy Simulation of the Proximal Region of a Spatially Developing Circular Jet” Phys. Fluids 8 2125 2137 1996
- Vuorinen, V. Hillamo, H. Nuutinen, M. Kaario, O. Larmi, M. Fuchs, L. “Large-Eddy Simulation of Droplet Stokes Number Effects on Turbulent Spray Shape” Atomization and Sprays 20 93 114 2010
- Wolfram|Alpha http://www.wolframalpha.com Oct. 2010
- van Driest, E. R. “On Turbulent Flow Near a Wall” Journal of the Aeronautical Sciences 23 1007 1011 1036 1956
- OpenFOAMwiki “snapEdge” http://openfoamwiki.net/index.php/Contrib_snapEdge Sept. 2010
- “OpenFOAM, The Open Source CFD Toolbox, User Guide” OpenCFD ltd. Jul. 2009
- CSC -It Center for Science “Hippu: HP ProLiant DL785 G5 server pair” http://www.csc.fi/english/research/Computing_services/computing/servers/hippu Sept. 2010
- CSC - It Center for Science “Louhi: Cray XT4/XT5” http://www.csc.fi/english/research/Computing_services/computing/servers/louhi Sept. 2010
- Jeong, J. Hussain, F. “On the Identification of a Vortex” J. Fluid Mech 285 69 94 1995
- Vasillyev, O. V. Lund, T. S. Moin, P. “A General Class of Commutative Filters for LES in Complex Geometries” J. Comput. Phys. 146 82 104 1998